750 kV线路高抗退出运行电磁暂态计算分析

Calculation and Analysis of Electromagnetic Transient for 750 kV Transmission Line with High Voltage Reactors Decommissioning

高压并联电抗器是长距离超高压线路的主要设备之一,因其自身故障率较高、电网结构改变、运行方式变化等原因,使高抗原始配置条件发生变化。针对某750 k V线路首端变电站高抗内部产生乙炔,给线路正常运行带来隐患,对其退出运行的可行性进行研究。应用EMTPE电磁暂态仿真软件,重点计算了线路在首端高抗退出工况下和正常运行工况下的工频过电压、操作过电压、潜供电流和恢复电压以及非全相运行过电压。计算结果表明该线路首端并联电抗器退出运行是可行的,系统工频过电压、操作过电压可满足运行要求,但需要将快速重合闸改为慢速重合闸。

750 kV HV reactor is one of important main equipment in long EHV lines, which have a high failure rate of defect and whose original configuration conditions change owing to the changing of grid structure and operation mode. There is an EHV line whose first end reactors had acetylene in its body to bring hidden dangers during the normal operation, so we carries out electromagnetic transient studies on disengaging feasibility of. It is used EMTPE, focusing on power frequency overvohage, switch-on and single-phase reclosing operating overvohage, secondary-arc currents and recovery voltage, and fundamental resonance overvohage when EHV reactors running in and out of working. The studies have shown that the decommissioning of original EHV shunt reactors of the study line is feasible, the power frequency overvoltage and operating overvohage meeting operational requirements but also need to change the fast reclosing to slow reclosing.